Process of making pressed-steel nuts.



C. G. SWENSON.

PROCESS OF MAKING PRESSED STEEL NUTS.-

APPLICATION FILED DEC-12, I916.

' 1,228,260. Patented May 29, 1917.

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fir 1770!??575 .erations, with the CARL G. SWENSON, OF INDIANAPOLIS, INDIANA.

PROCESS OF MA KING PRESSED-STEEL NUTS.

To all ttlLOflL it may concern.

lie. it known that I, Cam. (l. Swanson, a citizen of the United States. residing at Indianapolis, in the county of Marion and State of lndiana, have invented a new and useful Process of Making Pressed Steel Nuts, of which the following is a specification.

1 t is the object of my invention to produce a pressed steel nut from sheet metal.

he accompanying drawing illustrates the various steps of my invention, the apparatus used for carrying it out, and also the initial disk of sheet metal and the final product.- a pressed steel nut. In the drawing, Figure l is a section through the first. set of dies, for performing the first two double acting punch raised; Fig. 2 is a similar view through the. same set of dies, with the punch lowered and the second step of the operation completed; Fig. 3 is a similar section through the second set of dies, for performing the third and last punching operation, com.- pleting the nut exterior-1y; Fig. 4 is a perspective view of the sheet metal disk produced by the first step of the operation, as

the starting point for the process; and l ig.

, 5 is a perspective view of the finished nut produced by my process from the sheet metal disk shown in Fig. 4.

The sheet metal plate 10 of suitable thickness is first placed on the lower die 11 of the first set of dies, beneath a double-acting punch having an outer part 12 and an inner part 13, and then the double-acting punch is caused to descend so that the outer part 12 first cooperates withthe lower die 11 to stamp out from the sheet metal plate 10 a blank in the form of a sheet metal disk It, as shown in Fig. 1. This disk is shown in perspective in Fig. 4. As soon as the outer part 12 of the double-acting punch has stamped out the disk 14:, the Inner part 13 escends through the outer part 12 and presses the disk 14 through the contracting opening in the die 11 to produce from such isk a cup 15,,as shown in Fig. 2, this cup when formed dropping from the die 11 into a receptacle below. The two steps illustrated in Figs. 1 and 2 may be separated, but are preferably parts of one continuous operation, as illustrated.

Then the cup 15 is placed closed and downward within the polygonal opening 20 at the lower die 21 of the Specification of'Letters Patent. Application filed December 12, 1916. Serial No.

punching op- 1 2? form part of the second. set at dies (Fig. 3), ordinarily being sutli'ciently small to enter such opening freely; though if it is too large to enter such opening completely it is merely placed in the slightly flaring upper end 22 of such opening. Within the Patented May as, tor a.

opening 20 there. fits closely a movable carried by a stem 24 projecting down through the bottom of such die, such member 23 in efi'ect forming the bottom of the opening 20. A punch 25 cooperates with the die 21, and is polygonal in shape to correspond with the polygonal opening 20. This punch has a central substantially hemispherical boss or projection 26 on its lower end, and the member 23 has a-similar boss or projection 27 on its upper surface, the projections 2b and 27 opposi hg each other. The punch 25 descends on the side walls of the cup 15 within the opening 20, and the latter 1S compressed between such punch 25 and the member 23, so that the metal of the cup flows laterally outward substantially to fill the corners of the polygonal opening 20 and thus produce the polygonal contour of the nut. The opposing projections 26 and central hole with which the finished nut is to be provided, thus at the same time saving both metal and labor and assisting in forcing the metal outward to form the corners of the nut. In order still further to assist in forcing the metal outward into the corners, the outer portion of the under face of the punch 25, around the boss 26 is preferably made as a very flat cone, so that such surface is spaced farther from the mating part of the upper surface of the member 25 at the edge than near the bosses 26 and 27. Vhen the punch 25 is withdrawn, after completing its work the movable member 23 is moved upward by its stem 24. to force the nut blank- 28out of the opening 20. Then this nut blank is drilled and tapped to form the final threaded hole 29 in the finished nut 30.

By making the nut from the cup 15, the flow of the metal outward into the corners of the polygonal opening 20 is greatly en hanced, it indeed not wholly made possible,-

i the ends of the f the nut at the end toward of the cup Fig. 3 and the upper send in Fig. 5. As the corners of the opena ing 20 are not in any case completely filled,

the corners of the nut rounded, gracefully bottom in Fig. 3 and top in Fig.

15-the lower end in these rounded corners merg ng into the rounded ends (at the appearance, as is clear from Fig. 5.

In carrying out my process 1' find it desirable to anneal the article at an intermediate stage in the process, preferably after the parallel-sided cup has been formed; and when the finished nut has been produced 1 preferably case-harden it.

,I claim as my invention:

1. The process of making pressed steel nuts, comprising stamping out a sheet metal disk,'pres5ing the disk through a die to form a cup, compressing this cup within a. polygonal opening in a die by a correspondingly polygonal punch with the elements of the peripheral surface of the cup in alinement with the direction of pressure of the punch and at the same time forcing outward the also by mating projections metal of the cup onthe punch face and the bottom of the thus remain slightly 5) of the. prism sides 31 to produce a nut of finished screw-threading openin in the die, and axially drilling and interna ly screw-threading the polygonal member thus produced to form a nut.

2. The process of making pressed steel nuts, comprising stamping out a sheet metal disk, pressing the disk throng a die to a cup, compressing this cup within a polygonal opening in a die by a correspondingly polygonal punch with the elements of the peripheral surface of the cup in alinement,with the direction of pressure of the punch, and axially drilling and internally the polygonal member thus produced to form a nut. 3. The process of making pressed steel articles, comprising stumping out a sheet metal disk, pressing the disk into the form of a cup, and compressing this cup within a polygonal opening in a die by a correspondingly polygonal punch acting in alinement with the elements of the peripheral surface of said cup to thicken the walls of the latter and force the metal of the cup outward into the corners of such opening.

In witness whereof l have hereunto set my hand at Indianapolis, day of November, A. one hundred and sixteen.

CARL e. SWENSON.

Indiana, this 28th thousand nine 

